file photo/Google MapsA Robbinsville police officer was arrested last night after breaking into a home for people with disabilities and assaulting a wheelchair-bound mother and her 4-year-old son, the woman's father said today

ROBBINSVILLE – A Robbinsville police officer was arrested last night after breaking into a family's apartment and assaulting a mother in a wheelchair and her 4-year-old son, the Mercer County Prosecutor's Office said today.

Authorities say they have no idea why Sgt. Mark Lee, an 18-year department veteran, burst into the apartment at Project Freedom, a home for people with disabilities on Hutchinson Road. Knocking the woman from her wheelchair, Lee also allegedly went after the boy and assaulted him as well.

“He went berserk,” the father said of Lee this afternoon. “He broke in the house, knocked her down, tried to get on top of her.”

“Then he grabbed my grandchild," he said. The officer said, "I want the boy, I want the boy.'"

Lee was charged with official misconduct, two counts of aggravated assault, one count of endangering the welfare of a child, five counts of aggravated assault upon a police officer, and one count each of burglary, harassment and criminal mischief

The boy's father, also in a wheelchair, was unable to help as the family's home health aide fought back against Lee, the man said.

“He took his clothes off, gun, uniform, and pants, and tried to jump out the window,” the man said.

Fellow officers sent out on a 911 call of a woman being choked found Lee sitting on the couch, the prosecutor's office said. They arrested him and took him back to headquarters.

While he was being transported, Lee allegedly kicked out a rear window of a patrol car and escaped. Officers chased him down and took him back into custody after a struggle, the prosecutor's office said.

Lee was taken to the Crisis Center at Capital Health Regional Medical Center, where he remains. He has been suspended without pay from the police department. Lee was on-duty at the time of the incident.

The father said his daughter and grandson are in the hospital and are expected to recover.